Polaroid Spectra, an excellent frame size to work with and beautiful when expired!
Polaroid Spectra is my preferred instant film. It gives you a large image and wonderful colours which depends on how old the film is. As with most films of all kinds, when within its expiration date, Spectra provides natural colours if developed in a warm place. All Polaroid film gives you a purple hue when developed in the cold, and Spectra is no exception. Once expired, Spectra becomes more creamy and greens and browns pop. Streaks become more apparent in the film as well.
No matter how old the film though, I recommend using it mainly outdoors as indoor lighting is dim and colour casts are accentuated (which can be a good thing! I have an example in my images). All-in-all, Spectra is pretty sharp and gives you some lovely tones to work with.